Antelope Reservoir Report
Last Updated: December 5, 2025
Antelope Dam, located in Carbon County, Wyoming, is a privately owned structure designed by H.T.
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Summary
Person primarily for water supply purposes. Completed in 1945, this earth dam stands at a height of 18 feet and has a storage capacity of 74 acre-feet. The dam, situated on the Antelope Draw river or stream, serves the city of Alcova and has a surface area of 11 acres.
Despite its low hazard potential, Antelope Dam is rated as being in poor condition as of its last inspection in 2017. The dam's spillway, an uncontrolled type with a width of 400 feet, poses a moderate risk according to assessments. With only one valve as an outlet gate and a drainage area of 4 square miles, the dam is regulated by the Wyoming State Engineer's Office and undergoes regular inspections, enforcement, and permitting.
Overall, Antelope Dam plays a crucial role in providing water supply to the surrounding area. Climate and water resource enthusiasts can appreciate the historical significance and ongoing maintenance efforts of this essential infrastructure in the region.
Year Completed |
1945 |
Dam Length |
450 |
Dam Height |
18 |
River Or Stream |
ANTELOPE DRAW |
Primary Dam Type |
Earth |
Surface Area |
11 |
Hydraulic Height |
13 |
Drainage Area |
4 |
Nid Storage |
74 |
Structural Height |
18 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Antelope